Add Travis CI config along with flake8 (Cloud-CV#21)

.coveragerc

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+[run]
+omit =
+    */python?.?/*
+source = evalai/
+
+[report]
+exclude_lines =
+    import
+    @click.*
+
+omit =
+    */python?.?/*
+    */tests/*

.coveralls.yml

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+service_name: travis-ci
+repo_token: yRccoqBMWwHa9gryKQ3BVIEN6l7RMGlFo

.travis.yml

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+language: python
+sudo: false
+python:
+  - "3.5"
+  - "3.6"
+
+install:
+  - pip install -r requirements.txt
+  - pip install coveralls
+
+script:
+  - flake8 ./
+  - py.test --cov . --cov-config .coveragerc
+
+after_success:
+  - coveralls --rcfile=.coveragerc
+
+notifications:
+  email:
+    on_success: change  # [always|never|change]
+    on_failure: always  # [always|never|change]
+    slack: cloudcv:gy3CGQGNXLwXOqVyzXGZfdea

requirements.txt

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+beautifulsoup4==4.6.0
+beautifultable==0.5.0
+click==6.7
+coverage==4.5.1
+coveralls==1.3.0
+flake8==3.0.4
+lxml==4.2.1
+pytest==3.5.1
+pytest-cov==2.5.1
+requests==2.18.4
+requests-toolbelt==0.8.0
+responses==0.9.0

setup.cfg

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+[flake8]
+max-line-length = 120
+exclude = .git,docs/,env/,venv/